Editing Binoculars (section)

===Marine===
[[File:Морской бинокль FUJINON 7x50 MTRC-SX.jpg|thumb|7×50 marine binoculars with dampened [[compass]]]]
[[File:US Navy 021206-N-1328C-501 Signalman 3rd Class Tiffany Culereth from Bronx, N.Y., observes ships in the area through binoculars called "Big Eyes.".jpg|thumb|US Naval ship 'Big eyes' 20×120 binoculars in fixed mounting]]

There are binoculars designed specifically for civilian and military use under harsh environmental conditions at sea. Hand held models will be 5× to 8× magnification, but with very large prism sets combined with eyepieces designed to give generous eye relief. This optical combination prevents the image vignetting or going dark when the binoculars are pitching and vibrating relative to the viewer's eyes due to a vessel's motion.<ref>{{Cite web |url=https://www.svb24.com/en/guide/binoculars.html |title=Make the right choice of marine binoculars |access-date=2022-04-10 |archive-date=2021-07-28 |archive-url=https://web.archive.org/web/20210728034807/https://www.svb24.com/en/guide/binoculars.html |url-status=live }}</ref>

Marine binoculars often contain one or more features to aid in navigation on ships and boats.

Hand held marine binoculars typically feature:<ref>{{Cite web |url=https://www.yachtingworld.com/yachts-and-gear/best-marine-binoculars-7-of-the-best-pairs-137229 |title=What to look for in a good pair of marine binoculars |date=27 October 2021 |access-date=2022-04-10 |archive-date=2022-05-31 |archive-url=https://web.archive.org/web/20220531190818/https://www.yachtingworld.com/yachts-and-gear/best-marine-binoculars-7-of-the-best-pairs-137229 |url-status=live }}</ref>
* Sealed interior: O-rings or other seals prevent air and moisture ingress.
* Nitrogen or argon filled interior: the interior is filled with 'dry' gas to prevent internal fogging/tarnishing of the optical surfaces. As fungi can not grow in the presence of an inert or noble gas atmosphere, it also prevents [[lens fungus]] formation.
* Independent focusing: this method aids in providing a durable, sealed interior.
* Reticle scale: a navigational aid which uses a horizon line and a vertical scale for measuring the distance of objects of known width or height – sometimes an important navigational aid.
* Compass: A compass bearing projected in the image. Dampening helps to read the compass bearing on a moving ship or boat.
* Floating strap: some marine binoculars float on water, to prevent sinking. Marine binoculars that do not float are sometime supplied with or provided by the user as an aftermarket accessory with a strap that will function as a flotation device.

Mariners also often deem an adequate low light performance of the optical combination important, explaining the many 7×50 hand held marine binoculars offerings featuring a large 7.14&nbsp;mm exit pupil, which corresponds to the average pupil size of a youthful dark-adapted human eye in circumstances with no extraneous light.

Civilian and military ships can also use large, high-magnification binocular models with large objectives in fixed mountings.